( 846 ) 



and their development, to enable us to form a correct judgment 

 about their exact position. 



With regard to the Nematoda I want to add that to me it seems 

 to be an error to look upon the parasitical Nematoda as descended 

 from those which are nowadays found li\'ing freely in the sea or 

 in fresh water or in moist soil. All these latter are far too uniform 

 to allow us to look upon tliein as ancestral forms. This phylum can 

 be better understood, when we consider the parasitical forms as the 

 older primitive ones and qu the other hand derive the free-living 

 forms from them, as parasites which have adapted themselves 

 secondarily to a free existence. What the origin of the parasitical 

 Nematoda in their turn may have been i-emains an open question 

 for the present. 



Of what has been briefly summai'ised above, 1 hope to give a 

 more elaborate exposition in the current number of the ".lenaische 

 Zeitschrift fiir NaturwisseuschatV' which is now going through the 

 press, in which periodical also IjANo's paper, which induced me to 

 write this article, appeared. To that number I refer for further 

 particulars. 



Zoology. — Prof. jMax Weber reads a paper: ''On some of the 

 re.'^i(Its of the Si/HH/ft-Ej'pedttion." 



(This paper will not he puhlislied in those Proceedings). 



Anthropology. — Prof. L. Bolk reads a paper on: ''The dispersion 

 of the blondine and hrunette type in our country." 

 (This paper will not he puhlished in these Proceedings). 



Chemistry. — Prof. C. A. Tobry de Bruyn also in the name of 

 Dr. R. P. VAN Cat/'ar presents a paper on: "Chawjes of 

 concentration in and crystallisation, from solutions by centri- 

 fuyal power." 



(This paper will not he published hi these Proceedings). 



Chemistry. — Piof. (1 A. Lobry de Bruyn presents a paper of 

 Mr. 0. L. .luNGK'S: " Theoretical consideration concerniny boundary 

 reactions inhich decline in two or more successive phases." 

 (This paper will not be published in tliese Proceedings). 



(May 27, 1904). 



